1. the wide part of a river where it meets the ocean and is affected by tides

Examples

• The estuary is where fresh water from the river mixes with salt water from the sea.
• Many fish species breed in the estuary during spring.
• The Chesapeake Bay is one of the largest estuaries in North America.
• Estuaries are important habitats for birds and marine life.
• The estuary's ecosystem is sensitive to pollution and climate change.
• Boats can navigate the estuary at high tide.
• Salt marshes are common features found in estuaries.